package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    WeChatProperties weChatProperties;
    @Autowired
    UserMapper userMapper;

    @Override
    public User userLogin(UserLoginDTO userLoginDTO) throws IOException {
        //访问微信接口获取appid
        String openid = getOpenid(userLoginDTO);
        //判断openid是否为空（如果传过来的code是错误的）
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是不是新用户
        User user = userMapper.findkUser(openid);
        if(user == null){
            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insertUser(user);
        }

        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        String url = "https://api.weixin.qq.com/sns/jscode2session";
        Map map = new HashMap();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type"," authorization_code");
        //返回的数据是一个json的字符串
        String json = HttpClientUtil.doGet(url, map);
        //解析字符串，转变为json对象
        JSONObject jsonObject = JSONObject.parseObject(json);
        String openid = (String) jsonObject.get("openid");
        return openid;
    }
}
